Relocating to DC area. Thoughts on rust?

Took mines to Automotive Protection Services in Fairfax a few days ago for their undercoating treatment, as an essential employee I have to drive in such conditions. Hopefully I can find a clean 80 rust free from the west coast for cheap and sort of pamper and baseline it while I beat the current one.

They had to scrap the loose paint and rust and sprayed some type of rust eliminator then undercoated. Feels kind of sticky but the whole thing was just shy under a grand including labor, and rust prevention in the door cavities (150$) an extra option. So would of just cost about 800$ just for the treatment (4hrs of srapping, rust eliminator and coating). Also I can go every year and do a "touch up" for under 100$. A little expensive side but worth it in my case as time was a factor, also it was pouring and hot around here. Also gives me more time to baseline the truck hoses, fluids, brakes and now AC lol